Scissors



Filed June 29, 1928 gwum'vfor/ I v v 92 I r 1.

1 Norm @110,

Patented Jan; 6, 1931 THOMAS s. CRAMZPTON, or rronnnnvrnnn, IDAHOsorssonspf Application filed .l'nne 29,

This invention relates to scissors, one of the ob ects belng to lmproveupon the structure of devices of this type whereby the shear- I ingaction will be improved greatly, the cutting edges will be preventedfrom binding against the opposed blades at points back of the cuttingedges, said cutting edges will be caused'properly to Cooperatethroughout the length thereof, and wear upon the bearing .10 portion andupon the blades can be compensated for readily. v V,

With, the foregoing and other objects in view which will appear as thedescription proceeds the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed it being understood that changes in the preciseembodiment of the invention herein disclosed may be made within the Izoscope of what is claimed without departing from the spiritoftheinvention.

In the accompanying drawings the preferred form of the invention hasbeen shown.

In said drawings,

v Figure 1 is a plan view.

I Figure 2 is a side elevation;

-Figure 3 is a section-on line 33, Figure 2. Figure l is a section online l4, Figure 1. Figure 5 is a section on line-55, Figure 1. Referringto the figures by characters of reference 1 and 2 designate therespective blades of the scissors, each having a shank 3 extendingtherefrom. The free end of each shank merges into an eye 4c produced bycoiling the end portion of the shank, the terminal of one of these coilsbeing offset as shown at 5 to constitutea stop against which the opposedshank will abut when the scissors are closed.

Theblades are connected by a'pivot bolt 6 and the meeting faces of theblades are 1101- lowed out or concaved as shown at 7, these concavitiesextending from the pivot portions of the blades a short distance towardthe points of the blades. Close to the pivot 6 and p at that sidethereof nearest the eyes 4: there are provided bearing surfaces .8adapted to contact one with the other, thereby to force the bladestoward each other when they are so moved from open to closed positions.

-1928; :Seria1 a sassin. 1

The twoblades areslightly twistedtransversely 'sothat they contactsolely at their edges. This eliminates any friction andwear such asgenerally produced where the cutting edges, slidably engage thefiatfaces of the blades between the edges thereof. This will be obvious byreferring to Figure 5. V

The pivot bolt 6 is extended through the middle portions of clampingplates 9 which extend transversely of and beyond opposed portions of theblades and bear firmly against the outer-faces thereof. The projectingend portions of these plates are connected adj ustably by bolts 10adapted to be tightened by means of nuts 11. The scissors are to be usedlike ordinary ones but will be found superior theretobecause, as aresult of the twistimparted to the blades, said blades. will. onlycontact where their cutting edges cross. there will be no spacing apartof the cutting edges where engaging thematerial being operated on. Byproviding the concavities 7 it becomes possible, by tightening the bolts10 to impart an increased lateral tilt to the blades and to'compensatefor wear upon the edges The bearingfaces 8 cooperate to insure properpressure of the cutting edges against each other throughout the lengththereof and more particularly adjacent the. points of the blades. Themovement of the blades relative to each other is of course limited bythe abutment 5 cooperating with one of the shanks 3. I v

lVhat is claimed is: i 7 The combination of pivotally connected bladeseach provided with a longitudinal cutting edge, each blade having atransverse twist whereby the cutting edges are the only contacting partsofthe blades remote from the pivot thereof, shanks terminating in eyes,bearing portions integral with and interposed betweenv the blades andtheir shanks, said portions having straight, substantially parallel sideportions, means on one of the. eyes cooperating with one of the shanksfor limiting the relative swinging movement of the blades in onedirection, there being concavities in the inner faces of the bearingportions adjacent to the pivot and extended Consequently;

7 toward the cutting edges, cooperating project'ing bearing surfaces onsaid bearing por- '7 tions adjacent to the pivot and between j the pivotand the shanks; means separate. from and adapted to be bodily applied toor jx emoved from the blades, for holding the" blades together, saidmeans including clamp ing plates extending transversely of 'the' bladesand mounted onlthe pivot,said plates firmly engaging the outer faces oft'he'bl'ad's adjacent to the pivot and .proj ectingllaterally beyond theblades, and adjustable connec tions between th'e'projecting ends of"the- Q plates,' said plates bearing on the blades at j 7 pointsdirectly opposite the'concavities and bearing faces as my OWIl,' Ihavelhereto aflixedmy signature. r

I THOMASCBAMPTON.

In testiinony that I clailn the foiegoingj" I d

